No subject

keep during a `git filter-branch' on every commit, but that's not
ideal. For example, a file in collection "a" that is destined for
package "a" may have originated in "b" (think "mzlib"), where the
same-named file sticks around in "b" after the copy. It's nicer and
cleaner to have irrelevant files disappear after the relevant copy/move
is made.

So, I took one more step: "slice.rkt" constructs a range of commits
during which the file should exist, based on when it was moved or
copied. (Forks and merges are a minor obstacle, which the script works
around by enlarging ranges to hit commits in the `--first-parent'
traversal.) Conceptually, the result is a mapping from commit ids to
paths, but that would be a big table to read on every `filter-branch'
step, so it's reported as a table of commits with enter/leave
transitions. The output of "slice.rkt" is files: "state.rktd" for the
set of files to be kept in the initial commit, and "actions.rktd" to
specify the transitions.

The enclosed "prune.rkt" script works with `git filter-branch
--index-filter'. It uses "actions.rktd" (read-only) and "state.rktd"
(which it updates via transitions).


The Racket git repo is large, so I've only tried the `git
filter-branch' step so far on smaller repos, such as the "iplt"
repository. In my clone of "iplt", I `git mv'ed "web/internal" to
"ex/internal". Then, with the scripts in "/tmp",

 racket /tmp/slice.rkt ex /tmp
 git filter-branch --index-filter "racket /tmp/prune.rkt /tmp" --prune-empty

leaves the repo with only the files of "ex", and `git log --follow'
on various files looks right.

I'll try on a clone of the Racket repo and report back.

FWIW, before doing this for real, I'd want to add a `--msg-filter' that
extends each commit message to add the original commit id, since we
have references to the old ids in various places (and so it would be
handy to have them in the new repos).

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